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| author |   Yafang Shao <laoar.shao@gmail.com> | 2019-03-26 20:13:09 +0800 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-04-08 09:22:51 -0400 |
| commit | 163363455b42a1cf833742177149d1352dfe673e (patch) | |
| tree | 456d1d7fcd0b6e960f192ee1f25d193de68db280 /include/linux/tracepoint.h | |
| parent | tracing: Add error_log to README (diff) | |
| download | linux-dev-163363455b42a1cf833742177149d1352dfe673e.tar.xz linux-dev-163363455b42a1cf833742177149d1352dfe673e.zip | |
tracing: introduce TRACE_EVENT_NOP()
Sometimes we want to define a tracepoint as a do-nothing function.
So I introduce TRACE_EVENT_NOP, DECLARE_EVENT_CLASS_NOP and
DEFINE_EVENT_NOP for this kind of usage.
Link: http://lkml.kernel.org/r/1553602391-11926-2-git-send-email-laoar.shao@gmail.com
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/tracepoint.h')
| -rw-r--r-- | include/linux/tracepoint.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index 9c3186578ce0..86b019aa2839 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -548,4 +548,19 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p) #define TRACE_EVENT_PERF_PERM(event, expr...) +#define DECLARE_EVENT_NOP(name, proto, args) \ + static inline void trace_##name(proto) \ + { } \ + static inline bool trace_##name##_enabled(void) \ + { \ + return false; \ + } + +#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \ + DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args)) + +#define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print) +#define DEFINE_EVENT_NOP(template, name, proto, args) \ + DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args)) + #endif /* ifdef TRACE_EVENT (see note above) */ |